Set of members forming upper frame of construction machine

ABSTRACT

A set of members forming an upper frame of a construction machine includes a center section, a left side deck, and a right side deck. The left side deck has a left deck beam. The right side deck has a right deck beam. At least one of the left deck beam or the right deck beam is adjustment deck beams. The adjustment deck beam has a contacting part that is adapted to be brought into contact with and is also adapted to be welded to an external side surface of an adjustment-side longitudinal plate, a first opposing part that is adapted to be opposed to a side surface of the bottom plate and is also adapted to be welded to the side surface, and a second opposing part that is adapted to be opposed to an upper surface of the bottom plate with a height-adjustment gap therebetween.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a set of members forming an upper frameof a construction machine.

2. Description of the Related Art

Conventionally, there is known an upper frame of a construction machinethat includes a center section to which a working device is fitted andside decks which are provided at left and right sides of the centersection (refer to Japanese Patent Application Laid-open No. 2007-030866,for example).

The center section has a bottom plate, and a pair of left and rightlongitudinal plates that are erected at inner sides than left and rightedge parts of the bottom plate and that are extended in a front and reardirection. Each side deck has a side frame extended in a front and reardirection, and deck beams for coupling the side frame to the centersection.

In coupling the deck beams of the side decks to respective longitudinalplates of the center section, the longitudinal plates and the deck beamsneed to be welded together after height positions of the side decks tothe center section are adjusted.

Specifically, the side decks are combined with the center section, andfront end parts of the deck beams are brought into contact with externalside surfaces of the longitudinal plates. Next, adjusting plates foradjusting heights are welded to lower parts of the deck beams while theadjusting plates are being brought into contact with a side surface ofthe bottom plate of the center section. Consequently, the side decksbecome slidable in a height direction along contact surfaces between thedeck beams and the longitudinal plates and along contact surfacesbetween the adjusting plates and the bottom plate. After the side decksare adjusted to proper height positions, contact portions between thefront end parts of the deck beams and the external side surfaces of thelongitudinal plates and contact portions between the adjusting platesand the side surface of the bottom plate are welded respectively, and anupper frame is configured as a result.

However, the upper frame of the conventional construction machinerequires a work of welding the adjusting plates to the lower parts ofthe deck beams when performing a work of welding the side decks to thecenter section. Therefore, there has been a problem in that the weldingwork becomes complex and the number of parts increases resulting in acost increase.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a set of membersforming an upper frame of a construction machine capable of improvingworking efficiency by facilitating adjustment of height positions ofside decks to a center section in a simple configuration.

A set of members forming an upper frame of a construction machineaccording to one aspect of the present invention includes: a centersection having a bottom plate, a left longitudinal plate erected at aninner side of a left edge part of the bottom plate, and a rightlongitudinal plate erected at an inner side of a right edge part of thebottom plate, the left longitudinal plate and the right longitudinalplate extended in a front and rear direction; a left side deck arrangedat a left side of the center section; and a right side deck arranged ata right side of the center section. The left side deck has a left sideframe extended in a front and rear direction, and a left deck beam forcoupling the left side frame to the left longitudinal plate of thecenter section, and the right side deck has a right side frame extendedin a front and rear direction, and a right deck beam for coupling theright side frame to the right longitudinal plate of the center section.At least one of the left deck beam or the right deck beam is anadjustment deck beam by which a height position relative to the centersection can be adjusted. The adjustment deck beam has a contacting partthat is adapted to be brought into contact with and is also adapted tobe welded to an external side surface of an adjustment-side longitudinalplate opposing the adjustment deck beam out of the left longitudinalplate and the right longitudinal plate, a first opposing part that isadapted to be opposed to a side surface of the bottom plate and is alsoadapted to be welded to the side surface when the contacting part isbrought into contact with the external side surface of theadjustment-side longitudinal plate, and a second opposing part that isadapted to be opposed to an upper surface of the bottom plate by havinga height-adjustment gap in an up and down direction in a state where thecontacting part is brought into contact with the external side surfaceof the adjustment-side longitudinal plate and also the first opposingpart is opposed to the side surface of the bottom plate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a configuration of a constructionmachine according to an embodiment of the present invention;

FIG. 2 is a perspective view showing a state before each side deck iscombined to a center section (a set of members forming an upper frame ofa construction machine);

FIG. 3 is a perspective view showing a state after each side deck iscombined to the center section (the upper frame of the constructionmachine);

FIG. 4 is a cross-sectional view showing a state before a deck beam iscombined to a longitudinal plate;

FIG. 5 is a cross-sectional view showing a state where a height of aside deck is being adjusted;

FIG. 6 is a cross-sectional view showing a state where the side deck hasbeen welded to the center section; and

FIG. 7 is a view corresponding to FIG. 5 showing a configuration of adeck beam according to a modification of the present embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENT

An embodiment of the present invention is described below with referenceto the drawings. The following description of a preferred embodiment isessentially no more than description of exemplifications, and is notintended to limit the present invention and application or usagethereof. In FIG. 1, up and down, front and rear, and left and rightdirections are respectively indicated by arrowheads. Unless otherwisespecifically stated, the up and down and other directions are describedfollowing the directions indicated by the arrowheads.

FIG. 1 is a perspective view showing a configuration of a constructionmachine according to the embodiment of the present invention. As shownin FIG. 1, a construction machine 10 includes a lower running body 11,and an upper rotating body 12 rotatably supported on the lower runningbody 11.

The upper rotating body 12 has an upper frame 15 that becomes aframework base thereof, a working machine 13 derrickably fitted to theupper frame 15 at a front end part of the upper frame 15, acounterweight 16 fitted to a rear end side of the upper frame 15 to takeweight balance with the working machine 13, and a cab 17 arranged at aportion at a left front side of the upper frame 15.

The working machine 13 is for performing a digging operation and thelike. The working machine 13 has a boom 13 a having a base end partthereof turnably fitted to the upper rotating body 12, an arm 13 bturnably fitted to a front end side of the boom 13 a, and a bucket 13 cturnably fitted to a front end side of the arm 13 b. The boom 13 a, thearm 13 b, and the bucket 13 c are respectively driven by a correspondinghydraulic cylinder 13 d.

As shown in FIG. 2, a set of members 15 a configuring the upper frameincludes a center section 20 positioned at a central part in a vehiclewidth direction (a left and right direction), a left side deck 30Lcoupled to a left side of the center section 20, and a right side deck30R coupled to a right side of the center section 20. FIG. 3 shows anupper frame 15 configured by having both the side decks 30L and 30Rcoupled to the center section 20.

The center section 20 has a bottom plate 21, and a left longitudinalplate 22L and a right longitudinal plate 22R that are erected at innersides than left and right edge parts of the bottom plate 21 and areextended in a front and rear direction. The bottom plate 21 is formed bya thick steel plate. The longitudinal plates 22L and 22R are joined tothe bottom plate 21 by welding.

The left side deck 30L has a left side frame 31L extended in a front andrear direction, and left deck beams 32L for coupling the left side frame31L to the left longitudinal plate 22L of the center section 20. Theright side deck 30R has a right side frame 31R extended in a front andrear direction, and right deck beams 32R for coupling the right sideframe 31R to the right longitudinal plate 22R of the center section 20.The left deck beams 32L and the right deck beams 32R are respectivelyarranged by three, each having a gap in a front and rear direction.Specifically, first deck beams 32L and 32R from the front respectivelyand second deck beams 32L and 32R from the front respectively haveclosed cross-sectional shapes. Third deck beams 32L and 32R from thefront are respectively configured by erecting one plate material.

A front end part of each of the side frames 31L and 31R is provided witha front frame 36 that is extended from each of the side frames 31L and31R toward a center section 20 side. A rear end part of each of the sideframes 31L and 31R is provided with a rear frame 37 that is extendedfrom each of the side frames 31L and 31R toward a center section 20side. Each front frame 36 and each front end part of the first deckbeams 32L and 32R from the front respectively are coupled together byeach coupling frame 38.

The side decks 30L and 30R are respectively combined to the centersection 20. An end part of the left deck beam 32L at a left longitudinalplate 22L side is brought into contact with an external side surface 22a of the left longitudinal plate 22L, and at the same time, an end partof the right deck beam 32R at a right longitudinal plate 22R side isbrought into contact with an external side surface of the rightlongitudinal plate 22R so that these components in a contact state arewelded to one another, whereby the center section 20 and the side decks30L and 30R are coupled together.

In welding the side decks 30L and 30R to the center section 20, heightpositions of the side decks 30L and 30R to the center section 20 need tobe adjusted. By devising configurations of the deck beams 32L and 32R,adjustment of the height positions of the side decks 30L and 30R to thecenter section 20 is facilitated.

In the present embodiment, a configuration for facilitating heightposition adjustment relative to the center section 20 is employed in theleft side deck 30L on which the cab 17 is mounted. That is, in thepresent embodiment, the left deck beams 32L configure “adjustment deckbeams” by which a height position relative to the center section 20 canbe adjusted. Hereinafter, only the left side deck 30L is described. Asimilar configuration may be also employed in the right side deck 30R.

In the left side deck 30L, a first left deck beam 32L from the front anda second left deck beam 32L from the front are formed in closedcross-sectional shapes. The first and second left deck beams 32L havebeam members 33 that have a pair of vertical plates 33 a opposing eachother in a front and rear direction and that are formed incross-sectional concave shapes having openings at lower sides, andreinforcing plates 34 for coupling lower edge parts of the pair ofvertical plates 33 a. Front end parts of the beam members 33 (end partsat a left longitudinal plate 22L side)configure contacting parts 32 cthat are brought into contact with the external side surface 22 a of theleft longitudinal plate 22L so that the contacting parts 32 c can bewelded to the external side surface 22 a. The beam members 33 couple theleft side frame 31L and the left longitudinal plate 22L. A third leftdeck beam 32L from the front is formed by erecting one plate material,and couples the left side frame 31L and the left longitudinal plate 22L.That is, in the present embodiment, the left side frame 31L configuresan “adjustment frame”, and the left longitudinal plate 22L configures an“adjustment-side longitudinal plate”.

As shown in FIGS. 4 and 5, a part of a lower part of each of the pair ofvertical plates 33 a of the beam members 33 at a left longitudinal plate22L side is cut off Accordingly, a second opposing part 32 a that isopposed to an upper surface 21 a of the bottom plate 21 is formed byhaving a height-adjustment gap, at a lower part of the beam member 33.The second opposing part 32 a has a shape extended in a directionparallel with a horizontal direction.

The reinforcing plates 34 are arranged to have a predetermined distancein a left and right direction from a front end part (the contacting part32 c) of the beam member 33. As shown in FIGS. 4 and 5, a side surfaceof the reinforcing plate 34 is continuously extended downward from thesecond opposing part 32 a of the beam member 33. The side surface of thereinforcing plate 34 configures a first opposing part 32 b that isopposed to a side surface 21 b of the bottom plate 21 to enable thefirst opposing part 32 b to be welded to the side surface 21 b when thecontacting part 32 c of the beam member 33 is brought into contact withthe external side surface 22 a of the left longitudinal plate 22L. Thefirst opposing part 32 b has a shape extended to a direction parallelwith a vertical direction that is vertical to the second opposing part32 a.

When the contacting part 32 c of the beam member 33 is brought intocontact with the external side surface 22 a of the left longitudinalplate 22L, the first opposing part 32 b of the left deck beam 32Lopposes the side surface 21 b of the bottom plate 21. In this state,because a height-adjustment gap is formed in an up and down directionbetween the second opposing part 32 a of the left deck beam 32L and theupper surface 21 a of the bottom plate 21, the left side deck 30L can beadjusted to a proper height position by sliding the left side deck 30Lin a height direction (an up and down direction) along a contact surfacebetween the contacting part 32 c of the left deck beam 32L and theexternal side surface 22 a of the left longitudinal plate 22L and alongan opposing surface between the side surface of the reinforcing plate 34as the first opposing part 32 b and the side surface 21 b of the bottomplate 21.

In the example shown in FIG. 5, although the side surface of thereinforcing plate 34 as the first opposing part 32 b and the sidesurface 21 b of the bottom plate 21 are brought into contact with eachother, a gap of a size (about 2 mm, for example)which permits weldingmay be provided between both side surfaces. By providing the gap, a sizeerror of the left deck beam 32L can be absorbed. This gap is set to asize small enough to allow the gap to be buried by welding the firstopposing part 32 b to the side surface 21 b of the bottom plate 21.

As shown in FIG. 6, after the left side deck 30L is adjusted to a properheight position, a contact portion between the contacting part 32 c ofthe beam member 33 and the external side surface 22 a of the leftlongitudinal plate 22L, and an opposing portion between the side surface(the first opposing part 32 b) of the reinforcing plate 34 and the sidesurface 21 b of the bottom plate 21 are welded respectively. As aresult, the upper frame 15 is configured. At this time, height-positionadjustment of the left side deck 30L becomes easy, by first welding theopposing surface between the first opposing part 32 b and the sidesurface 21 b of the bottom plate 21, and in this state by sliding theleft side deck 30L in a height direction (an up and down direction)along the contact surface between the contacting part 32 c and theexternal side surface 22 a of the left longitudinal plate 22L.Therefore, it is preferable that the upper frame 15 is configured byfirst welding the opposing surface between the first opposing part 32 band the side surface 21 b of the bottom plate 21, then by adjusting aheight position of the left side deck 30L in this state, and last bywelding the contact surface of the contacting part 32 c to the externalside surface 22 a of the left longitudinal plate 22L.

In the above configuration, by adjusting a height position of the leftside deck 30L using the first opposing part 32 b as a pivot point, aheight position of the left side deck 30L to the center section 20becomes easy. Therefore, working efficiency improves. Further, a work ofwelding a height-adjustment member to a lower part of the left deck beam32L and the like can be omitted. This omission contributes to improveworking efficiency and also contributes to cost reduction by decreasingthe number of parts.

Further, because a load applied to the left side deck 30L is dispersedto a welding portion between the contacting part 32 c of the beam member33 and the external side surface 22 a of the left longitudinal plate 22Land to a welding portion between the side surface (the first opposingpart 32 b) of the reinforcing plate 34 and the side surface 21 b of thebottom plate 21, rigidity of the upper frame 15 is secured.

Modification

The above embodiment may be also configured as follows.

In the above embodiment, an example of a configuration is described thatthe first left deck beam 32L from the front and the second left deckbeam 32L from the front respectively have the contacting part 32 c, thefirst opposing part 32 b, and the second opposing part 32 a. That is,the end part of the beam member 33 at the left longitudinal plate 22Lside configures the contacting part 32 c, the lower end part of each ofthe pair of vertical plates 33 a configures the second opposing part 32a, and the side surface of the reinforcing plate 34 coupled to the lowerpart of the beam member 33 configures the first opposing part 32 b.However, shapes of the left deck beams 32L are not limited to the aboveexample. For example, as shown in FIG. 7, the third left deck beam 32Lfrom the front, that is, the left deck beam 32L formed by erecting oneplate material, may be configured to have the contacting part 32 c, thefirst opposing part 32 b, and the second opposing part 32 a.Specifically, by cutting off a lower part of a front end part (an endpart at a left longitudinal plate 22L side) of the left deck beam 32Lconfigured by a plate material, a remaining portion of the front endpart of the left deck beam 32L may configure the contacting part 32 c,and also this recessed portion may form the second opposing part 32 aand the first opposing part 32 b that is continuously extended downwardfrom the second opposing part 32 a.

The number of the left deck beam 32L may be one.

As described above, the present invention is extremely useful and hashigh industrial applicability because high practical utility is obtainedthat height adjustment of the side decks to the center section isfacilitated and working efficiency can be improved in a simpleconfiguration.

The above detailed embodiment mainly includes inventions having thefollowing configurations.

The set of members forming an upper frame of a construction machineincludes: a center section having a bottom plate, a left longitudinalplate erected at an inner side of a left edge part of the bottom plate,and a right longitudinal plate erected at an inner side of a right edgepart of the bottom plate, the left longitudinal plate and the rightlongitudinal plate extended in a front and rear direction; a left sidedeck arranged at a left side of the center section; and a right sidedeck arranged at a right side of the center section. The left side deckhas a left side frame extended in a front and rear direction, and a leftdeck beam for coupling the left side frame to the left longitudinalplate of the center section, and the right side deck has a right sideframe extended in a front and rear direction, and a right deck beam forcoupling the right side frame to the right longitudinal plate of thecenter section. At least one of the left deck beam or the right deckbeam is an adjustment deck beam by which a height position relative tothe center section can be adjusted. The adjustment deck beam has acontacting part that is adapted to be brought into contact with and isalso adapted to be welded to an external side surface of anadjustment-side longitudinal plate opposing the adjustment deck beam outof the left longitudinal plate and the right longitudinal plate, a firstopposing part that is adapted to be opposed to a side surface of thebottom plate and is also adapted to be welded to the side surface whenthe contacting part is brought into contact with the external sidesurface of the adjustment-side longitudinal plate, and a second opposingpart that is adapted to be opposed to an upper surface of the bottomplate by having a height-adjustment gap in an up and down direction in astate where the contacting part is brought into contact with theexternal side surface of the adjustment-side longitudinal plate and alsothe first opposing part is opposed to the side surface of the bottomplate.

According to the set of members, height adjustment of the side deck tothe center section is facilitated, and working efficiency can beimproved in a simple configuration. Specifically, when the contactingpart of the adjustment deck beam is brought into contact with theexternal side surface of the adjustment-side longitudinal plate and alsowhen the first opposing part is opposed to the side surface of thebottom plate, because a height-adjustment gap is formed between thesecond opposing part and the upper surface of the bottom plate, the sidedeck can be adjusted to proper height positions by sliding the side deckto a height direction along the contact surface between the contactingpart and the external side surface of the adjustment-side longitudinalplate and along the opposing surface between the first opposing part andthe side surface of the bottom plate. Therefore, the work of welding theheight-adjustment member to a lower part of the deck beam and the likeas conventionally required can be omitted. Consequently, workingefficiency improves, and cost reduction can be achieved by decreasingthe number of parts.

After the side deck are adjusted to proper height positions, a contactportion between the contact part of the adjustment deck beam and theexternal side surfaces of the longitudinal plates, and a opposingportion between the first opposing part of the adjustment deck beam andthe side surface of the bottom plate are welded respectively. As aresult, the upper frame is configured. With this configuration, rigidityof the upper frame is secured because a load applied to each side deckis dispersed to a welding portion between the contacting part of theadjustment deck beam and the external side surface of the longitudinalplate and to a welding portion between the first opposing part of theadjustment deck beam and the side surface of the bottom plate.

Further, in the set of members, it is preferable that the adjustmentdeck beam has: a beam member that has downward opening shapes and thatcouple an adjustment frame opposed to the adjustment-side longitudinalplate, out of the left side frame and the right side frame, to theadjustment-side longitudinal plate, an end part of the beam member at anadjustment-side longitudinal plate side configuring the contacting part;and a reinforcing plate that partially blocks the openings of the beammember. The reinforcing plate is arranged at a predetermined distance ina left and right direction from the contacting part such that when thecontacting part of the beam member is brought into contact with theexternal side surface of the adjustment-side longitudinal plate, aportion of the reinforcing plate opposed to the side surface of bottomplate configures the first opposing part while a portion of the beammember opposed to an upper surface of the bottom plate configures thesecond opposing part.

With the above configuration, rigidity of the adjustment-side deck beamcan be secured while maintaining easiness of adjusting a height positionof the side deck to the center section. Specifically, by arranging thereinforcing plate for securing rigidity of the adjustment-side deck beamto have a predetermined distance in a left and right direction from thecontacting part of the beam member, rigidity of the adjustment-side deckbeam can be secured because the adjustment-side deck beam is configuredby the beam member and the reinforcing plate. Further, the secondopposing part is formed in the beam member, and the side surface of thereinforcing plate function as the first opposing part.

In the set of members, it is preferable that the first opposing part isopposed to the side surface of the bottom plate with a gap therebetweenwhen the contacting part is brought into contact with the external sidesurface of the adjustment-side longitudinal plate, and the gap has asize small enough to allow the gap to be buried by welding between thefirst opposing part and the side surface of the bottom plate.

With the above configuration, a welding work can be performed byabsorbing a size error of the adjustment-side deck beam. Specifically,when a distance from the contacting part of the adjustment-side deckbeam to the first opposing part is shorter than a distance from theexternal side surface of the adjustment-side longitudinal plate to theside surface of the bottom plate due to a size error of theadjustment-side deck beam, the first opposing part is brought intocontact with the side surface of the bottom plate before the adjustmentdeck beam is brought into contact with the external side surface of theadjustment-side longitudinal plate. This has a problem in that a gapoccurs between the contacting part of the adjustment deck beam and theexternal side surface of the adjustment-side longitudinal plate.

On the other hand, according to the present invention, a size error ofthe adjustment deck beam is absorbed because a gap is provided betweenthe first opposing part and the side surface of the bottom plate.Because this gap has a size (about 2 mm, for example)that permitswelding, that is, a size small enough to allow the gap to be buried bywelding the first opposing part to the side surface of the bottom plate,the welding work can be securely performed.

Further, the present invention includes a manufacturing method formanufacturing the upper frame of a construction machine. Themanufacturing method includes: a preparing process for preparing the setof members; an adjusting process for adjusting a height position in anup and down direction of each adjustment deck beam to the center sectionin a state where the contacting part is brought into contact with theexternal side surface of the adjustment-side longitudinal plate and alsothe first opposing part is opposed to the side surface of the bottomplate; and a welding process for welding, after the adjusting process, acontact portion between the contacting part and the external sidesurface of the adjustment-side longitudinal plate and an opposingportion between the first opposing part and the side surface of thebottom plate, respectively.

According to the present manufacturing method, a height position of theside deck to the center section can be adjusted by only displacing theadjustment deck beam in an up and down direction in a state where thecontacting part is brought into contact with the external side surfaceof the adjustment-side longitudinal plate and also the first opposingpart is opposed to the side surface of the bottom plate. Further, theupper frame having sufficient rigidity can be easily configured bywelding a contact portion between the contacting part and the externalside surface of the adjustment-side longitudinal plate and an opposingportion between the first opposing part and the side surface of thebottom plate.

This application is based on Japanese Patent application No. 2012-259536filed in Japan Patent Office on Nov. 28, 2012, the contents of which arehereby incorporated by reference.

Although the present invention has been fully described by way ofexample with reference to the accompanying drawings, it is to beunderstood that various changes and modifications will be apparent tothose skilled in the art. Therefore, unless otherwise such changes andmodifications depart from the scope of the present invention hereinafterdefined, they should be construed as being included therein.

What is claimed is:
 1. A set of members forming an upper frame of aconstruction machine, comprising: a center section having a bottomplate, a left longitudinal plate erected at an inner side of a left edgepart of the bottom plate, and a right longitudinal plate erected at aninner side of a right edge part of the bottom plate, the leftlongitudinal plate and the right longitudinal plate extended in a frontand rear direction; a left side deck arranged at a left side of thecenter section; and a right side deck arranged at a right side of thecenter section, wherein the left side deck has a left side frameextended in a front and rear direction, and a left deck beam forcoupling the left side frame to the left longitudinal plate of thecenter section, the right side deck has a right side frame extended in afront and rear direction, and a right deck beam for coupling the rightside frame to the right longitudinal plate of the center section, atleast one of the left deck beam or the right deck beam is an adjustmentdeck beam by which a height position relative to the center section canbe adjusted, and the adjustment deck beam has a contacting part that isadapted to be brought into contact with and is also adapted to be weldedto an external side surface of an adjustment-side longitudinal plateopposing the adjustment deck beam out of the left longitudinal plate andthe right longitudinal plate, a first opposing part that is adapted tobe opposed to a side surface of the bottom plate and is also adapted tobe welded to the side surface when the contacting part is brought intocontact with the external side surface of the adjustment-sidelongitudinal plate, and a second opposing part that is adapted to beopposed to an upper surface of the bottom plate by having aheight-adjustment gap in an up and down direction in a state where thecontacting part is brought into contact with the external side surfaceof the adjustment-side longitudinal plate and also the first opposingpart is opposed to the side surface of the bottom plate.
 2. The set ofmembers according to claim 1, wherein the adjustment deck beam has: abeam member that has downward opening shapes and that couple anadjustment frame opposed to the adjustment-side longitudinal plate, outof the left side frame and the right side frame, to the adjustment-sidelongitudinal plate, an end part of the beam member at an adjustment-sidelongitudinal plate side configuring the contacting part; and areinforcing plate that partially blocks the openings of the beam member,and the reinforcing plate is arranged at a predetermined distance in aleft and right direction from the contacting part such that when thecontacting part of the beam member is brought into contact with theexternal side surface of the adjustment-side longitudinal plate, aportion of the reinforcing plate opposed to the side surface of bottomplate configures the first opposing part while a portion of the beammember opposed to an upper surface of the bottom plate configures thesecond opposing part.
 3. The set of members according to claim 1,wherein the first opposing part is opposed to the side surface of thebottom plate with a gap therebetween when the contacting part is broughtinto contact with the external side surface of the adjustment-sidelongitudinal plate, and the gap has a size small enough to allow the gapto be buried by welding between the first opposing part and the sidesurface of the bottom plate.
 4. The set of members according to claim 2,wherein the first opposing part is opposed to the side surface of thebottom plate with a gap therebetween when the contacting part is broughtinto contact with the external side surface of the adjustment-sidelongitudinal plate, and the gap has a size small enough to allow the gapto be buried by welding between the first opposing part and the sidesurface of the bottom plate.